95 



253. P. natans L. 



Occurs here and Ihere in lakes and small strcams (f. jUwiatilis Fr.). 



Sando: the lakes at Sands (C. J., !), lake between Sands and Skopen (!), 

 lake at Skopen (!); Str.: strcani near Hojvig (!); Syd.: Kvalbo (R.); Vaago : 

 in Sorvaagsvatn (C. J.); Ost.: the lakes near Ejde (Simnions, !). 



Rostrup very corrcctly ijointed out (p. 62) that the P. nalans mentioned by 

 the older authors is not the above-mentioned species, but the universalh' distri- 

 ])uted P. polijgonifolins. He does not mention the true P. naUwH as occurring on 

 the islands, thougli he gathered spccimens of it at Kvalbo. 



It bears spikes only at a few piaces (Ejde and Sando) and at only 

 one of these localities (Nigitjern at Sands) were speciniens found bearing 

 fruit sparingly, so it can hardly propagate itself by seed. 



254. P. pepfoliatus L. 



Occnrs liere and there in lakes from a depth of about ^/2 m. 

 Sando: Sandsvatn (R, !), Saltvigsvatn (!), lake between Sands and Sko- 

 pen (!); Syd.: lake in Norbesejde (R.), Vaagvatn (R.,!), lake in Kvan- 

 hauge (!); Ost.: Toftevatn (!\ the large lake near Ejde (!). 



In flower only in Vaagvatn in the middle of July, and in fruit 

 in Saltvigsvatn at the end of August. 



255. P. polygonifolius Pourr. 



Common everywhere in ditches and pools; extending from the 

 lowland up to about 400 m. (Ost.: Bredaskard (C. J.)). Very variable. 

 Fl. June— July. Fruiting freely, August. 



256. P. ppaelongus Wulf. 



Syd.: in the lake in Vatnsdal (!); in the Herbarium of the Botanical 

 Gardens, Copenhagen there are specimens from the Færoes gathered by 

 Lyngbye. 



It had no spikes in July. 



257. P. pusillus L. 



On Sando, in Saltvigsvatn (!) and the lake between Sands and 

 Skopen, both piaces in abundance at the depth of about 1 m. ; Ost.: 

 the large lake near Ejde(!). Occurs on soft sea-bottom, does not nearly 

 reach the surface and consequently found without spikes. 



Landt also mentions P. liiccns and says that »it is generally eaten by geese.« 

 This seems to indicate that it was fairly common, but as it has not been met 

 With Ijy later authors, he doubtless confused it with P. perfoUatus L. 



258. Ruppia maritima L. f. rostellata (Koch). 



Syd.: On the delta at the mouth of a smaller streani in the valley 

 of Kvalbo (R., !). 



Beginning to flower at the end of July. 



259. Zostera marina L. 



Syd.: Vaagfjord (Landt,!, Helgi Jonsson). 



Landt p. 210) writes 'that it grows »in flords where the water is 

 calm, e. g. at Vaag on Svdero«. This must, however, be the only place 



